Nope. I don't see anything about the audio at all.

I just know that for my setup, whenever I plug anything into my HDMI port on my TV, I get stereo audio.

It could be that my TV doesn't handle the audio decoding properly, but I imagine that it isn't exclusive to my Toshiba.

HDMI supports 7.1 surround. I'm not sure what kind of setup you have where you get sound from your TV to your sound system, but you can buy an HDMI splitter for something like $10 that will give you an optical audio signal and a video-only HDMI signal.